angularJS随笔

1.作用域

基于作用域的事件传播

作用域可以像DOM节点一样，进行事件的传播。主要是有两个方法：

broadcasted ：从父级作用域广播至子级 scope
emitted ：从子级作用域往上发射到父级作用域

<!doctype html>

<html ng-app>

<head>

    <script src="http://code.angularjs.org/1.2.25/angular.min.js"></script>

</head>

<body>

    <div ng-controller="EventController">

        Root作用域<tt>MyEvent</tt> count:{{count}}

        <ul>

            <li ng-repeat="i in [1]" ng-controller="EventController">

                <button ng-click="$emit('MyEvent')">$emit('MyEvent')</button>

                <button ng-click="$broadcast('MyEvent')">$broadcast('MyEvent')</button>

                <br>

                Middle作用域<tt>MyEvent</tt> count: {{count}}

                <ul>

                    <li ng-repeat="item in [1, 2]" ng-controller="EventController">

                        Leaf作用域<tt>MyEvent</tt> count: {{count}}

                    </li>

                </ul>

            </li>

        </ul>

    </div>

    <script type="text/javascript">

        function EventController($scope) {

            $scope.count = 0;

            $scope.$on('MyEvent', function() {

                $scope.count++;

            });

        }

    </script>

</body>

</html>

基于作用域的事件传播

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